refactor(@angular/ssr): remove CSR fallback for invalid hosts #2775

Job	Run time
build	32s
lint	2m 6s
build-e2e-windows	32s
e2e-windows	0s
test	0s
publish-snapshots	-1s
Browser Compatibility Tests	-1s
e2e-package-managers	-1s
e2e	-1s
e2e-snapshots	-1s
	3m 5s

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